Question :
51. In a voltaic cell, the electron flow always from
A)the : 1335549
51. In a voltaic cell, the electron flow is always from
A)the salt bridge to the cathode.
B)the salt bridge to the anode.
C)the oxidizing agent through the salt bridge to the reducing agent.
D)the reducing agent through the salt bridge to the oxidizing agent.
E)the anode to the cathode.
52. Consider a voltaic cell that corresponds to the following reaction:
Fe(s) + Ni2+(aq) ? Fe2+(aq) + Ni(s)
Which of the following statements is correct?
A)Iron is the oxidizing agent.
B)The Ni2+ solution must be in the half-cell with the iron electrode.
C)No salt bridge is necessary, since the charge is 2+ on both sides of the equation.
D)The nickel electrode is the cathode.
E)Four electrons will be transferred per atom of iron that reacts.
53. Consider a voltaic cell that corresponds to the following reaction:
Mg(s) + Sn2+(aq) ? Mg2+(aq) + Sn(s)
Which of the following statements is correct?
A)Magnesium is the oxidizing agent.
B)The Sn2+ solution must be in the half-cell with the magnesium electrode.
C)No salt bridge is necessary, since the charge is 2+ on both sides of the equation.
D)The tin electrode is the cathode.
E)Four electrons will be transferred per atom of magnesium that reacts.
54. Consider a voltaic cell that corresponds to the following reaction:
Zn(s) + Cu2+(aq) ? Zn2+(aq) + Cu(s)
Which of the following statements is correct?
A)Zinc is the oxidizing agent.
B)The Cu2+ solution must be in the half-cell with the zinc electrode.
C)No salt bridge is necessary, since the charge is 2+ on both sides of the equation.
D)The zinc electrode is the cathode.
E)Two electrons will be transferred in this reaction per atom of zinc that reacts.
55. Consider a voltaic cell that corresponds to the following reaction:
Cu(s) + 2Ag+(aq) ? Cu2+(aq) + Ag(s)
Which of the following statements is correct?
A)Copper is the reducing agent.
B)The Cu2+ solution must be in the half-cell with the silver electrode.
C)No salt bridge is necessary, since the charge is 2+ on both sides of the equation.
D)The copper electrode is the cathode.
E)Four electrons will be transferred in this reaction per atom of copper that reacts.
56. Given the following reaction in a voltaic cell:
Cu(s) + 2Ag+(aq) ? 2Ag(s) + Cu2+(aq)
Which of the following statements is correct?
A)Cu(s) is the anode.
B)Oxidation occurs at the silver electrode.
C)There is no cathode for this cell.
D)Ag(s) is the anode.
E)One mole of electrons is transferred in the reaction as written.
57. In a fuel cell that uses gaseous hydrogen and oxygen as reactants, which one of the following reactions is occurring at the anode?
A)2H2O ? 2H2 + O2D)O2 + 4e– ? 2O2–
B)H2 ? 2H+ + 2e–E)2O2– ? O2 + 4e–
C)2H+ + 2e– ? H2
58. Consider a voltaic cell that corresponds to the following reaction:
Cu(s) + 2Ag+(aq) ? Cu2+(aq) + Ag(s)
If this reaction takes place in the electrochemical cell shown in the figure, which of the following statements is incorrect?
A)I is the copper electrode, which is the anode.
B)II is the Ag+ solution.
C)III is the salt bridge.
D)V contains the substance that is being reduced.
E)V is the silver electrode, which is the cathode.
59. Consider a voltaic cell that corresponds to the following reaction:
Zn(s) + Cu2+(aq) ? Zn2+(aq) + Cu(s)
If this reaction takes place in the electrochemical cell shown in the figure, which of the following statements is incorrect?
A)I is the zinc electrode, which is the anode.
B)II is the Cu2+ solution.
C)III is the salt bridge.
D)IV contains the substance that is being reduced.
E)V is the copper electrode, which is the cathode.
60. Consider a voltaic cell that corresponds to the following reaction:
Mg(s) + Sn2+(aq) ? Mg2+(aq) + Sn(s)
If this reaction takes place in the electrochemical cell shown in the figure, which of the following statements is incorrect?
A)I is the magnesium electrode, which is the anode.
B)II is the Mg2+ solution.
C)III is the salt bridge.
D)IV contains the substance that is being oxidized.
E)V is the tin electrode, which is the cathode.
